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no longer need doT55x7Acquisition...

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This commit is contained in:
marshmellow42 2017-04-05 21:37:04 -04:00
commit bed24f53c2
3 changed files with 1 additions and 76 deletions
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4
armsrc/lfops.c
View file

@ -1132,7 +1132,7 @@ void T55xxResetRead(void) {
TurnReadLFOn(READ_GAP);
// Acquisition
doT55x7Acquisition(BigBuf_max_traceLen());
DoPartialAcquisition(0, true, BigBuf_max_traceLen());
// Turn the field off
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
@ -1266,8 +1266,6 @@ void T55xxReadBlock(uint16_t arg0, uint8_t Block, uint32_t Pwd) {
// Now do the acquisition
DoPartialAcquisition(0, true, 12000);
// doT55x7Acquisition(12000);
// Turn the field off
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
cmd_send(CMD_ACK,0,0,0,0,0);

67
armsrc/lfsampling.c
View file

@ -259,73 +259,6 @@ uint32_t SnoopLF()
return ret;
}
/**
* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds
* the data is collected in BigBuf.
**/
void doT55x7Acquisition(size_t sample_size) {
#define T55xx_READ_UPPER_THRESHOLD 128+60 // 60 grph
#define T55xx_READ_LOWER_THRESHOLD 128-60 // -60 grph
#define T55xx_READ_TOL 5
uint8_t *dest = BigBuf_get_addr();
uint16_t bufsize = BigBuf_max_traceLen();
if ( bufsize > sample_size )
bufsize = sample_size;
uint16_t i = 0;
bool startFound = false;
bool highFound = false;
bool lowFound = false;
uint8_t curSample = 0;
uint8_t lastSample = 0;
uint16_t skipCnt = 0;
while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt<1000 && i<bufsize ) {
WDT_HIT();
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
AT91C_BASE_SSC->SSC_THR = 0x43;
LED_D_ON();
}
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
LED_D_OFF();
// skip until the first high sample above threshold
if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
//if (curSample > lastSample)
// lastSample = curSample;
highFound = true;
} else if (!highFound) {
skipCnt++;
continue;
}
// skip until the first Low sample below threshold
if (!startFound && curSample < T55xx_READ_LOWER_THRESHOLD) {
//if (curSample > lastSample)
lastSample = curSample;
lowFound = true;
} else if (!lowFound) {
skipCnt++;
continue;
}
// skip until first high samples begin to change
if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD+T55xx_READ_TOL){
// if just found start - recover last sample
if (!startFound) {
dest[i++] = lastSample;
startFound = true;
}
// collect samples
dest[i++] = curSample;
}
}
}
}
/**
* acquisition of Cotag LF signal. Similart to other LF, since the Cotag has such long datarate RF/384
* and is Manchester?, we directly gather the manchester data into bigbuff

6
armsrc/lfsampling.h
View file

@ -8,12 +8,6 @@
void doCotagAcquisition(size_t sample_size);
uint32_t doCotagAcquisitionManchester(void);
/**
* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds
* the data is collected in BigBuf.
**/
void doT55x7Acquisition(size_t sample_size);
/**
* Initializes the FPGA for reader-mode (field on), and acquires the samples.
* @return number of bits sampled